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,y G. P. GARD. ELECTRO DYNAMIC MACHINE.

(No Model.)

Patented Mar. -27

I: llllll l l.- um u 5o rubber or other like substance.

Y UNITED STATES PATENT OEEICE...

GEORGE F. CARD, OF COVINGTON, KENTUCKY, ASSIGNOR TO THE GEORGE F. CARD MANUFACTURING COMPANY, OF SAME PLACE.

ELECTRO-DYNAMlC MACHINE.

SPECIFICATION forming part of Letters Patent No. 380,020, dated March 2'7, 1888.

Application led June B, 1887. Serial No. 240.644. (No model.)

To @ZZ w/wm it may concern:

Be it known that I, GEORGE F. CARD, of Covington, Kenton county, Kentucky, have invented a new and useful Improvement in 5 Electro-Dynamic Machines or Motors,of which the following is a specification.

My invention is an improvement in the class of electric motors such as illustrated in my patent, No. 364,086, granted May 31, 1887; and it consists in features of useful novelty,herein after described and specified.

In the accompanying drawings, Figures I, II, and III are respectively a front elevation, a rear elevation, and an axial section of a machine embodying my improvements; Fig. IV represents the means employed by me to connect each two consecutive bobbins with their appropriate commutator-plate. Fig. V is a top view of the brushholder,two commutatorplates being shown in the section.

The base 1 and the standard 2 may be integral parts of a single casting ofrbronze or other non-magnetic metal.

3 and 4 are respectively the eld and armature rings of my motor. The annular core or ring 3 of my field is screwed fast at its polar protuberances N S to the standard 2. Screwed to therear faces of the same'gprotuberances is a web or bearing-plate, 7, of phosphor-bronze or other non-magnetic metal, to which is likewise screwed a soft-iron forging which constitutes the interior eld-magnet core,and which consists of a central fillet, 5, that vconnects a pair of flattened cylindrical cores, 6. This forging constitutes the core of my interior eld-magnet, which magnet is, in the present form of my invention, magnetically insulated from my exterior magnet, as will presently appear. Acentral orifice in the said forging and like orices in the non-magnetic plates 2 and 7 receive suitable journals, 9, of the armature- Shaft 8.

The armature-ring is screwed fast to a web, 10, of phosphor-bronze orother non-magnetic metal, whose hub 1l is keyed or otherwise firmly secured to the shaft 8. A nut, 12, on the screw-threaded extremity of the said hub 11,and a rubber gasket, 13,hold firmly against the face of the said web 10 a disk, 14, of hard A shallow brass clips 18, which are screwed fast to the rubber disk 14. A brass washer, 19, being interposed between the said disk and the respective clips,serves the double purpose of elevating the said clips sufficiently from the face of the disk and of affording attachment for the wires 6C 20 21 from the neighboring pair of armaturebobbins, as shown in Figs. III and IV. Electrical connection of these wires is secured by the close contact of the brass clip 18 with both,

while the electrical loop thus formed has, 6 5

through the same clip, the electrical communication with the proper plate of the series of commutator-plates required in this type of machines.

The described construction enables inspec- 7o tion of said bobbin-connections and of renewal of any one or more commutatorplates without dismemberment of the machine.

Screwed fast to the standard 2 is a plate, 22,

of vulcanized fiber or like substance, and

The preferred winding (in series) of the field 8 5 and armature is shown diagrammatically in l the several figures.

To enable ready attachment of the machine to a bench or other fixture, the base l has a vertical orifice, 3l, for a pivot-bolt, 32, which 9o secures a clamp or yoke, 33, having two rigid jaws, 34 35, of which the lower jaw, 35, carries a set-screw, 36, to screw against the under side of such bench. The screw 32 having been temporarily slackened, the machine may be adjusted to any desired angle for convenient belting or other purposes.

My aforesaid patent recited some of theadvantages incident to a construction in which the interior and exterior eld-cores have magroc netic continuity. Such arrangement of the parts obviously secures two diametrically-remote extremities of high polar intensity restricted to two limited portions of the circnmference.

In my present arrangement the number of polar terminals is doubled and the magnetic action is distributed over much longer aros in the plane of rotation, with consequently more equable and more prolonged polar action.

Each mode of construction is believed to possess its own special advantages for application to different uses.

I claim as new and of my invention- 1. In an electro-dynamic or electro-magnetic machine, the combination of the following elements, to wit: the front and rear non-magnetic bearing-plates, 2 7, and the mechanically-at- GEORGE E. CARD.

Attest:

WVM. B. THOMAS, GEO. I-I. KNIGHT. 

